What was the original business meaning of the term 'Black Friday' before it became associated with post-Thanksgiving shopping?

Black Friday has become a global retail phenomenon, with businesses offering massive discounts to kickstart the holiday shopping season. But how much do you really know about this major shopping event's business origins? Test your retail knowledge with this trivia question that explores the economic history behind one of retail's biggest days.

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The day retail businesses finally became profitable for the year, going from 'in the red' to 'in the black' financially
A stock market crash in 1869 when gold prices plummeted after financiers attempted to corner the gold market
The first day department stores used electronic cash registers, marking the 'blackout' of manual accounting
A retail industry code name for the secret day when annual inventory pricing strategies were determined